* Rocks don't "weather" on their own. Weathering is the process of rocks being broken down by natural forces like wind, rain, ice, and temperature changes.

* Size does matter. A smaller rock has a larger surface area relative to its volume compared to a boulder. This means:

* More surface exposed to weathering: Wind, rain, and freezing/thawing cycles have more surface to work on with a smaller rock.

* Easier to move: Smaller rocks are more likely to be moved by wind, water, or gravity, further exposing them to weathering agents.

However, the speed of weathering depends on several factors besides just size:

* Rock type: Some rocks are more resistant to weathering than others. Granite, for example, is very hard and resists weathering well, while limestone is more easily eroded.

* Climate: A hot, humid climate with lots of rain will cause faster weathering than a cold, dry climate.

* Exposure: A rock exposed on a mountaintop will weather faster than one buried underground.

So, while a smaller rock generally weathers faster due to its larger surface area, the speed of weathering is influenced by many factors.